pages/pitch-range/strong-m2: convert abused code tag

[ckiee]

`This` is meant to be used for code, not headers. Rendered.

[SumianVoice]

We'll need {: .no_toc } under each heading in that case. It might be better to use - **bold lists**

• bold lists

Unfortunately I can't see a way to remove heading anchor links so we might get very long links like https://wiki.sumianvoice.com/wiki/pages/pitch-range/strong-m2.md#when-i-come-down-i-drop-suddenly-in-pitch-and-get-very-heavy

There's also a way to set manual header IDs but I can't find anything in the very incomplete documentation for the theme.

[SumianVoice]

What I'll do is merge this and set to lists and we can change things later if need be

[aliialpaca]

For future reference, Jekyll uses the Kramdown renderer for Markdown by default; here's the Quick Reference page and Syntax page for Kramdown.

As for adding manual header IDs, you can add IDs to headers by adding {#myid} after them (see here for an example).